FastAPI or Flask app: from first file to live, step by step

1. Create a FastAPI app

mkdir my-api && cd my-api
python3 -m venv .venv
source .venv/bin/activate          # Windows: .venv\Scripts\activate
pip install fastapi "uvicorn[standard]" gunicorn

2. main.py

from fastapi import FastAPI

app = FastAPI()

@app.get('/')
def home():
    return {'message': 'Hello from Cloud Ninza'}

3. Test and freeze

uvicorn main:app --reload     # http://127.0.0.1:8000/docs
pip freeze > requirements.txt

4. Push, launch, configure

Push to GitHub. Launch an app → Python → plan → domain. App settings → Framework FastAPI / Starlette (ASGI) — the start command is gunicorn main:app -k uvicorn.workers.UvicornWorker …, so the file must be main.py and the object app. Add variables, Save all, connect Git deployments and Deploy now.

Flask instead

Name the file app.py with app = Flask(__name__), install flask gunicorn, freeze requirements, and choose the Flask preset (start gunicorn app:app …).

from flask import Flask
app = Flask(__name__)

@app.get('/')
def home():
    return 'Hello from Cloud Ninza'

Go live on your domain

Point the domain's @ and www A records to the IP shown in Domains, wait for Points here, then Issue free SSL → Always use HTTPS → Save changes.

Long jobs and bots

Requests should finish in seconds. For a Telegram/Discord bot or a script that runs on its own, choose the Python script / bot preset; for scheduled work use Cron jobs.